[jira] [Created] (AIRFLOW-6389) add config for 'allow_multi_scheduler_instances' default True

["t oo (Jira)" <ji...@apache.org>]

t oo created AIRFLOW-6389:
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             Summary: add config for 'allow_multi_scheduler_instances' default True
                 Key: AIRFLOW-6389
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-6389
             Project: Apache Airflow
          Issue Type: New Feature
          Components: scheduler
    Affects Versions: 1.10.6
            Reporter: t oo


airflow is often shared between users of varying experience levels. to prevent a novice user causing a accidental denial of service to the scheduler (by uploading huge dag which hogs all scheduler resources) i propose 2 new server side configs: 

 
 # max num of tasks in a single dag: default say 250
 # max num of dags: default say 500

 

To add to this airflow can't handle 18k tasks in single dag (dag_processor_manager times out after 300 seconds) , but if i split up into 6 dags of 3k tasks each then it works.



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